Income Taxes - Schedule of Significant Deferred Tax Assets And Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Components Of Deferred Tax Assets And Liabilities [Abstract]
Pension and other postretirement benefits plan liabilities	$ 293.7	$ 349.1
Net operating losses and other tax carryforwards	293.4	341.6
Accrued liabilities	166.0	164.3
Foreign depreciation	36.7	38.7
Other	41.0	34.6
Total deferred tax assets	830.8	928.3
Valuation allowances	(233.5)	(257.8)
Net deferred tax assets	597.3	670.5
Accelerated depreciation	(203.4)	(204.8)
Other intangible assets	(163.4)	(143.2)
Inventories	(24.0)	(24.4)
Other	(35.8)	(34.5)
Total deferred tax liabilities	(426.6)	(406.9)
Net deferred tax assets	$ 170.7	$ 263.6